Danny Horn played "Middle Kazran" (Kazran Sardick as a young man) in the Doctor Who story A Christmas Carol. This was the first role the twenty-one year old actor from Ilkley took. He began filming less than a week after graduating from the Central School of Speech and Drama. He has also begun filming a role in CBBC program M.I. High.
He later reprised his role as Kazran in the Big Finish Productions audio story Living History.